Bulk gold with hierarchical macro-, micro- and nano-porosity

Marie E. Cox, David C Dunand*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

Millimeter-sized, free-standing gold structures were created with three levels of multiscale porosity. First, macro- and microporosity, which are useful for mass and heat transport within the structure, are formed within an Ag-19. at.% Au alloy by salt powder replication during powder densification and by entrapped gas expansion during sintering, respectively. Nanoporosity, which provides high surface area, is then produced by silver dealloying of these Ag-19. at.% Au foams. The resulting hierarchical gold structures are annealed at 100-800 °C, thus coarsening the ligaments, increasing relative density, and healing cracks produced during dealloying. The first effect weakens the structure, while the other two make it stronger. A bulk Au sample with hierarchical porosity annealed at 600 °C shows good compressive ductility and a strength in agreement with models.

Original languageEnglish (US)
Pages (from-to)2401-2406
Number of pages6
JournalMaterials Science and Engineering A
Volume528
Issue number6
DOIs
StatePublished - Mar 15 2011

Keywords

  • Gold
  • Hierarchical foam
  • Mechanical characterization
  • Nanoporous
  • Porous materials
  • Powder metallurgy

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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